Mach number

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The Mach number, <math>M</math>, is the local flow-speed, <math>u</math>, divided by the local speed of sound, <math>a</math>: :<math>M \equiv \frac{u}{a} \equiv \frac{\mbox{local flow speed}}{\mbox{local speed of sound}}</math> The Mach number can be used to categorise a compressible flows into different [[Mach number regimes]] The name "Mach number" originates from the famous pioneer in compressible fluid dynamics [[Ernst Mach]] [[Category: Dimensionless parameters]]

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